Announcement is null when queried on feedItem Trigger

When i try to fetch announcements from feedItem trigger it returns null always, is there anything i'm missing

trigger Email_Feed_Trigger on FeedItem (after insert) {   
Set<Id> myfeed=new set<Id>();

for(FeedItem item : Trigger.New)
{
    myfeed.add(item.Id);
    }
    List<Announcement> lst=  [select id,SendEmails,FeedItemId,ParentId,createddate from Announcement where FeedItemId IN:myfeed];
   //lst is always blank
    system.debug(lst);
}

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